Other roles at Undo:Software Engineer Product Manager Sales Solutions Architect

Growth · Software Engineer Interview Guide

Interview language: English

How to Pass the Undo Software Engineer Interview in 2026

The Undo DNA (TL;DR)

The 'Precision Engineering' value at Undo drives the interview loop, assessing a candidate's ability to design resilient systems and deeply understand failure modes. Interviewers look for clear articulation of technical trade-offs, especially when discussing the architecture behind features like the ReplayEngine.

The Undo Interview Loop

Your onsite loop will typically consist of 4 rounds.

1
Round 1
Recruiter Screen
Motivation, role fit, logistics.
2
Round 2
Coding Screen
LeetCode-medium algorithmic problems under time pressure.
3
Round 3
System Design
Distributed systems, trade-offs at scale, architecture under constraints.
4
Round 4
Onsite Coding
LeetCode-hard, debugging, code clarity, edge cases.
5
Round 5
Behavioral / Leadership
Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

Based on our database of Undo interview outcomes, avoid these common traps:

Not handling overlapping or nested outage periods correctly.
Inefficiently handling the duration filter.
Not implementing proper retry mechanisms or backoff strategies.
Not considering different sampling strategies (head-based, tail-based, adaptive).

Test Yourself: Real Undo Questions

Three real prompts pulled from our database.

Type · collaboration

Describe a situation where you had a technical disagreement with a colleague or team member. How did you approach the discussion, and what was the resolution?

Type · design

Undo's core value is providing deep insights. Design a system that can sample and store traces from customer applications efficiently, allowing users to reconstruct request flows even with billions of events per day. Focus on minimizing storage costs while retaining essential debugging information.

Type · motivation

Undo helps companies understand their software's performance and reliability. What interests you about working on a product that provides deep technical insights into other companies' applications?

+ many more questions, signals, and worked examples

Unlock the Undo rubric, free

Undo Interview Question Bank

A sample from our database, grouped by round. Sign up to see the full set.

9 of 16 questions shown

Recruiter Screen

1
Type · motivation
Undo helps companies understand their software's performance and reliability. What interests you about working on a product that provides deep technical insights into other companies' applications?

Coding Screen

2
Type · algorithmic
Given a stream of user requests to a SaaS application, design an algorithm to detect and report potential performance regressions. For example, if the average response time for a specific API endpoint doubles over a 5-minute window, flag it. Assume you have limited memory.
3
Type · algorithmic
Undo's product needs to efficiently query historical performance data. Imagine you have a dataset of millions of events, each with a timestamp and a duration. Implement a function that, given a time range and a maximum duration, returns the count of events within that range and duration. Optimize for read performance.
+ 1 more questions in this round (sign up to unlock)

System Design

4
Type · design
Design a system for Undo that ingests and processes high-volume telemetry data (metrics, traces, logs) from thousands of customer applications in near real-time. Consider data ingestion, storage, querying, and aggregation.
5
Type · design
Undo needs to provide its customers with the ability to set up alerts based on complex conditions across their performance data (e.g., 'alert if P99 latency of /api/v1/users endpoint is > 500ms for 10 minutes AND error rate > 5%'). Design the alerting system, including rule definition, evaluation, and notification.
+ 1 more questions in this round (sign up to unlock)

Onsite Coding

6
Type · debugging
A customer reports that Undo's dashboard is showing inconsistent data for their service's error rate. Here's a simplified version of the data processing code. Find the bug and explain how you'd fix it.
7
Type · algorithmic
Implement a function to calculate the 'time to recovery' (TTR) for a given service, based on a stream of events indicating service availability or downtime. TTR is the duration between the start of an outage and the moment the service is fully restored. Handle intermittent failures and ensure accuracy.
+ 2 more questions in this round (sign up to unlock)

Behavioral / Leadership

8
Type · behavioral
Tell me about a time you fundamentally disagreed with a decision made by your manager or a senior leader. How did you approach the situation, and what was the outcome?
9
Type · ownership
Tell me about a time you identified a significant technical problem or opportunity in a project that wasn't explicitly assigned to you. What did you do, and what was the outcome?
+ 3 more questions in this round (sign up to unlock)

Unlock all 16 Undo questions, free

No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.

Unlock all 16 Undo questions

Interview tracks at Undo

How Undo's DNA translates across functions. Pick your role.

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Practice Undo interviews end-to-end

Undo Mock Interview

Run a live mock interview with our AI interviewer using Undo-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.

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STAR Stories for Undo Behavioral Rounds

Build a Story Bank of your past wins, mapped to the leadership signals Undo interviewers grade on. Reuse them across every behavioral round.

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Undo Interview Prep Hub

The frameworks behind every Undo round: CIRCLES for product sense, hypothesis-driven debugging for analytical, STAR for behavioral. Learn each one in 10 minutes.

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Interview Frameworks

CIRCLES, STAR, AARRR, RICE, MECE. The exact frameworks that make Undo interviewers nod instead of frown. Step-by-step playbooks with the moves and the pitfalls.

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Sample answers

What a strong answer to these Undo interview questions shows.

Describe a situation where you had a technical disagreement with a colleague or team member. How did you approach the discussion, and what was the resolution?

A strong answer shows: Constructive approach to disagreements.; Effective communication and active listening skills.; Focus on collaborative problem-solving and achieving team goals..

A strong answer shows: Knowledge of sampling strategies for distributed tracing.; Understanding of data compression and storage optimization.; Ability to balance cost and data utility..

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